class SettingsTrayHooks

class SettingsTrayHooks {
    
    /**
     * Implements hook_help().
     */
    public function help($route_name, RouteMatchInterface $route_match) {
        switch ($route_name) {
            case 'help.page.settings_tray':
                $output = '<h2>' . t('About') . '</h2>';
                $output .= '<p>' . t('The Settings Tray module allows users with the <a href=":administer_block_permission">Administer blocks</a> and <a href=":contextual_permission">Use contextual links</a> permissions to edit blocks without visiting a separate page. For more information, see the <a href=":handbook_url">online documentation for the Settings Tray module</a>.', [
                    ':handbook_url' => 'https://www.drupal.org/documentation/modules/settings_tray',
                    ':administer_block_permission' => Url::fromRoute('user.admin_permissions.module', [
                        'modules' => 'block',
                    ])->toString(),
                    ':contextual_permission' => Url::fromRoute('user.admin_permissions.module', [
                        'modules' => 'contextual',
                    ])->toString(),
                ]) . '</p>';
                $output .= '<h2>' . t('Uses') . '</h2>';
                $output .= '<dl>';
                $output .= '<dt>' . t('Editing blocks in place') . '</dt>';
                $output .= '<dd>';
                $output .= '<p>' . t('To edit blocks in place, either click the <strong>Edit</strong> button in the toolbar and then click on the block, or choose "Quick edit" from the block\'s contextual link. (See the <a href=":contextual">Contextual Links module help</a> for more information about how to use contextual links.)', [
                    ':contextual' => Url::fromRoute('help.page', [
                        'name' => 'contextual',
                    ])->toString(),
                ]) . '</p>';
                $output .= '<p>' . t('The Settings Tray for the block will open in a sidebar, with a compact form for configuring what the block shows.') . '</p>';
                $output .= '<p>' . t('Save the form and the changes will be immediately visible on the page.') . '</p>';
                $output .= '</dd>';
                $output .= '</dl>';
                return [
                    '#markup' => $output,
                ];
        }
    }
    
    /**
     * Implements hook_contextual_links_view_alter().
     *
     * Change Configure Blocks into off_canvas links.
     */
    public function contextualLinksViewAlter(&$element, $items) {
        if (isset($element['#links']['settings-trayblock-configure'])) {
            // Place settings_tray link first.
            $settings_tray_link = $element['#links']['settings-trayblock-configure'];
            unset($element['#links']['settings-trayblock-configure']);
            $element['#links'] = [
                'settings-trayblock-configure' => $settings_tray_link,
            ] + $element['#links'];
            // If this is content block change title to avoid duplicate "Quick Edit".
            if (isset($element['#links']['block-contentblock-edit'])) {
                $element['#links']['settings-trayblock-configure']['title'] = t('Quick edit settings');
            }
            $element['#attached']['library'][] = 'core/drupal.dialog.off_canvas';
        }
    }
    
    /**
     * Implements hook_block_view_alter().
     */
    public function blockViewAlter(array &$build) {
        if (isset($build['#contextual_links']['block'])) {
            // Ensure that contextual links vary by whether the block has config overrides
            // or not.
            // @see _contextual_links_to_id()
            $build['#contextual_links']['block']['metadata']['has_overrides'] = _settings_tray_has_block_overrides($build['#block']) ? 1 : 0;
        }
        // Force a new 'data-contextual-id' attribute on blocks when this module is
        // enabled so as not to reuse stale data cached client-side.
        // @todo Remove when https://www.drupal.org/node/2773591 is fixed.
        $build['#contextual_links']['settings_tray'] = [
            'route_parameters' => [],
        ];
    }
    
    /**
     * Implements hook_entity_type_build().
     */
    public function entityTypeBuild(array &$entity_types) {
        
        /** @var \Drupal\Core\Entity\EntityTypeInterface[] $entity_types */
        $entity_types['block']->setFormClass('settings_tray', BlockEntitySettingTrayForm::class)
            ->setLinkTemplate('settings_tray-form', '/admin/structure/block/manage/{block}/settings-tray');
    }
    
    /**
     * Implements hook_toolbar_alter().
     *
     * Alters the 'contextual' toolbar tab if it exists (meaning the user is allowed
     * to use contextual links) and if they can administer blocks.
     *
     * @todo Remove the "administer blocks" requirement in
     *   https://www.drupal.org/node/2822965.
     *
     * @see contextual_toolbar()
     */
    public function toolbarAlter(&$items) {
        $items['contextual']['#cache']['contexts'][] = 'user.permissions';
        if (isset($items['contextual']['tab']) && \Drupal::currentUser()->hasPermission('administer blocks')) {
            $items['contextual']['#weight'] = -1000;
            $items['contextual']['#attached']['library'][] = 'settings_tray/drupal.settings_tray';
            $items['contextual']['tab']['#attributes']['data-drupal-settingstray'] = 'toggle';
            // Set a class on items to mark whether they should be active in edit mode.
            // @todo Create a dynamic method for modules to set their own items.
            //   https://www.drupal.org/node/2784589.
            $edit_mode_items = [
                'contextual',
            ];
            foreach ($items as $key => $item) {
                if (!in_array($key, $edit_mode_items) && (!isset($items[$key]['#wrapper_attributes']['class']) || !in_array('hidden', $items[$key]['#wrapper_attributes']['class']))) {
                    $items[$key]['#wrapper_attributes']['class'][] = 'edit-mode-inactive';
                }
            }
        }
    }
    
    /**
     * Implements hook_block_alter().
     *
     * Ensures every block plugin definition has an 'settings_tray' form specified.
     *
     * @see \Drupal\settings_tray\Access\BlockPluginHasSettingsTrayFormAccessCheck
     */
    public function blockAlter(&$definitions) {
        foreach ($definitions as &$definition) {
            // If a block plugin does not define its own 'settings_tray' form, use the
            // plugin class itself.
            if (!isset($definition['forms']['settings_tray'])) {
                $definition['forms']['settings_tray'] = $definition['class'];
            }
        }
    }
    
    /**
     * Implements hook_css_alter().
     */
    public function cssAlter(&$css, AttachedAssetsInterface $assets, LanguageInterface $language) {
        // @todo Remove once conditional ordering is introduced in
        //   https://www.drupal.org/node/1945262.
        $path = \Drupal::service('extension.list.module')->getPath('settings_tray') . '/css/settings_tray.theme.css';
        if (isset($css[$path])) {
            // Use 200 to come after CSS_AGGREGATE_THEME.
            $css[$path]['group'] = 200;
        }
    }

}